<style type="text/css">
#seta21{
  position: absolute;
  top: 640px;
  left: 664.12px;
  width: 1px;
  height: 250px;
  border-top: 0px solid #000000;
  border-right: 0px solid #000000;
  border-bottom: 0px solid #000000;
  border-left: 1px solid #000000;
}

</style>
